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106. COMPOSITIONS,

EXAMINER I! COATING 0R PLASTIC. gm R f rence UNITED STATES PATENT OFFICE.

' JOHN FARXHAM BOYNTOX, OF SYRACUSE, NEW YORK, ASSIGNOR TO CARO- LIXE II. BOYNTOX.

CEMENT.

' SPECIFICATION forming part of Letters Patent N 0. 448,632, dated March 24, 1891. v 7 Application filed April 9,1?388- Serial No. 270,105. (No specimens.

To all whom it may concern.- I can make different grades of wall-plaster Be it known that I, J OHN FARNHAM BOYN- by varying the proportions of the ingredients TON, of the city of Syracuse, county of Ononi above set forth, and I therefore do not restrict daga, in the State of New York, have invented myself to the exact proportions; but these prol 5 a new and useful Fall Plaster or Cement, of 5 portions are correct to allintentsand purposes. 0 which the following a full, clear, and exact l What I claim as new, and desire to secure specification. by Letters Patent, is- 1 In carrying out my invention I use ground 1. The herein-described compound, consistgngrtz or finely-pulverized silex with common ing of ground quartz or sand, pulverized silex, I0 sand as the base of my composition. \Vith anhydrous selenite,li1nc carbonate, alumina, 35

ns ase I incorporate about an equal quansilicate of magnesia, amvlaceous silicate of tityof pulverized anhydrous selenite with ten soda, and carbonate 0E magnesia. per cent. oI car5onate of Iime, five per cent. j 2. The herein-described compound, consistof alumina, Iwo per cent. of silicate of magi ing of ground uartz or sand,pulverizedsilen, i5 nesia, one per cent. of amvlaceous silicate of anhydrus l1i'l.' 'e lime carbonate, alum na, 0

so a. and one-half per cent. 0 car ona e o' E 511651; 'f magnesia, amylaceous siliatbf magnesia which are intimately commu'iglecl soda, c'fi'rbonate"of n1a'nesia,and ground t'lfir W- u w n and form the cement or plaster. i\ 1th this sues of plants containing silerg, cellulose, and mass it is preferable, however, to mix ground amyloid substances,substantially as setforth. 2o straw of cereals or tissues of other plan s no I i In testimon ywhereof Iaffix my signature in 45 l I l 111 Si ex, ce n ose, and amvloid substances for presence of two witnesses:

leavening ant toughening the cement, Iherei JOHX FARNI-IAM BOYI\"ON. by preventing it from too rapidly hardening Witnesses: after having been saturated with water and i J OHN \V. TRUESDELL,

25 worked up as ordinary mortar. I CHAS. C. TRUESDELL. 

